2-oxo-2-phenylethyl (3R,4S)-3-azido-1-[N-(tert-butoxycarbonyl)-4-(trifluoromethyl)phenylalanyl]-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl]pyrrolidine-3-carboxylate → HCID 67517051, compound

Participants

Reaction Steps

A stirred solution of 2-oxo-2-phenylethyl (3R,4S)-3-azido-1-[N-(tert-butoxycarbonyl)-4-(trifluoromethyl)phenylalanyl]-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl]pyrrolidine-3-carboxylate (Step 1) in acetic acid (9 mL) was treated with zinc (201 mg, 3.08 mmol, 10 equiv), and the heterogeneous mixture was stirred at room temperature. After 1.25 h, the reaction was filtered, the filter pad was washed with acetic acid and ethyl acetate, and the filtrate was concentrated and dried under reduced pressure to give the crude (3R,4S)-3-amino-1-[N-(tert-butoxycarbonyl)-4-(trifluoromethyl)phenylalanyl]-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl]pyrrolidine-3-carboxylic acid (242 mg) as a clear film which was used without further purification. LC-MS ESI+ MS found for C29H43BF3N3O7 m/z 614.3 (M+H); ESI− MS m/z 612.3 (M−H).

Provenance & Evidence